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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    <title>Document</title>
    <link href="../static/bootstrap.min.css" rel="stylesheet">
    <script src="../static/jquery.min.js"></script>
    <script src="../static/bootstrap.min.js"></script>
</head>

<body>
    <div class="btn-group btn-group-lg">
        <button type="button" class="btn btn-default">按钮 1</button>
        <button type="button" class="btn btn-default">按钮 2</button>
        <button type="button" class="btn btn-default">按钮 3</button>
    </div>
    <div class="btn-group btn-group-sm">
        <button type="button" class="btn btn-default">按钮 4</button>
        <button type="button" class="btn btn-default">按钮 5</button>
        <button type="button" class="btn btn-default">按钮 6</button>
    </div>
    <div class="btn-group btn-group-xs">
        <button type="button" class="btn btn-default">按钮 7</button>
        <button type="button" class="btn btn-default">按钮 8</button>
        <button type="button" class="btn btn-default">按钮 9</button>
    </div>
</body>

</html>